Waronker recorded a cover version of the song "Catch" by The Cure specifically for the Songs For Summer compilation album, a memorial for Summer Brannin. The song was not included on the album upon its release, but was made available later on the record's promotional site.

Waronker founded her own record company, "Five Foot Two Records," with her sister-in-law Charlotte Caffey, on which she released her first solo record in 2002, titled Anna By Anna Waronker.

In the early 2000s, Waronker played several solo shows and a few other shows with the short-lived Ze Malibu Kids.

Waronker is also heard in the song "No Soul" by the band Say Anything.

Anna provides vocals on the tracks Be Calm and At Least I'm not as Sad as I Used to be by New York band Fun.

Waronker is in the process of releasing a follow up record, which she claims will be "darker/heavier" than her first album. The tentative title for the album is California Fade. On January 18, 2006 Waronker joined MySpace, allowing people to preview some of her new songs. The songs "How Am I Doing" and "Beautiful Life" were released for purchase on iTunes.

Waronker recently provided the score as well as the song "Beautiful Life" for a short film (co-written and directed by Mary Wigmore and Gwyneth Paltrow) called Dealbreaker as well as doing some of the original score for a film called Freshman Orientation. Dealbreaker premiered at The Sundance Film Festival in January 2006.